I don't know where to start. >> Consider the nucleus of a normal atom. We know and have mapped out electron shell structures. Nuclei too have structure but it'

I don't know where to start. >> Consider the nucleus of a normal atom. We know and have mapped out electron shell structures. Nuclei too have structure but it's way more inscrutable and complex as you have to deal with the electric repulsion between protons, the strong interaction between quarks (and gluons) and the strong interaction between nucleons. AFAIK we don't really have a good model for this. We have a great model for this, it's called quantum chromodynamics (QCD). >> neutron stars are probably the most complex objects in the Universe Nope, a human brain is far far far more complex than a neutron star. >> Black holes by comparison are quite simple: describle with three quantities (mass, spin, electric charge) Not exactly. Every isolated unstable black hole decays rapidly to a stable black hole; and (excepting quantum fluctuations) stable black holes can be completely described (in a Cartesian coordinate system) at any moment in time by these eleven numbers: mass–energy M M, linear momentum P (three components), angular momentum J (three components), position X (three components), electric charge Q Q. On top of that a study by Sasha Haco, Stephen Hawking, Malcolm Perry and Andrew Strominger postulates that black holes might contain "soft hair", giving the black hole more degrees of freedom than previously thought. https://en.wikipedia.org/wiki/No-hair_theorem#Soft_hair https://en.wikipedia.org/wiki/No-hair_theorem#Soft_hair